What does "it" refer to here?
"It" is referring to her traveling to every country in the world. Lexie says that if she wouldn't have traveled the world, she would regret that decision for the rest of her life. She says "it" because she already mentioned her traveling to every country earlier in the video. Here are examples of "it" being used to replace the subject of the sentence. Ex: She went to Spain last year and said it was amazing. A: How is your new job? B: It's going well! I like it a lot. Ex: We stayed at a hotel in Pennsylvania and it was awful.